mindblindness
n. The inability to perceive another person’s mental state.

Example Citation:
"What, ultimately, makes autistic people different? How do they experience the world? Twenty years ago no one had much of a clue. But a burgeoning body of research now suggests that the core of all autism is a syndrome known as mindblindness. For most of us, mind reading comes as naturally as walking or chewing. We readily deduce what other people know and what they don't, and we understand implicitly that thoughts and feelings are revealed in gestures, facial expressions and tone of voice. An autistic person may sense none of this."
—Geoffrey Cowley, "Understanding Autism," Newsweek, July 31, 2000

Earliest Citation:
Children with autism perform worse on tests of ascribing almost the full range of mental states (intentions, knowledge, pretence, deception, imagination, and so on). It is as if they suffer from a specific form of 'mindblindness'.
—Simon Baron-Cohen, "First lessons in mind reading," The Times Higher Education Supplement, July 16, 1995

Notes:
Today's word seems to have been minted by Simon Baron-Cohen, who published a book titled Mindblindness: An Essay on Autism and Theory of Mind in 1995. Mr. Baron-Cohen was also kind enough to supply the first media citation I could find for this term.

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